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SECURITIES - Securities Held-to-maturity Major Categories (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 579,965,000 | $ 179,309,000 |
Gross Unrecognized Gains | 328,000 | 59,000 |
Gross Unrecognized Losses | (48,423,000) | (2,014,000) |
Fair Value | 531,870,000 | 177,354,000 | $ 0
Agency Notes |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 88,957,000 |  |
Gross Unrecognized Losses | (9,201,000) |  |
Fair Value | 79,756,000 |  |
Corporate Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 5,000,000 |  |
Fair Value | 5,000,000 |  |
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 287,959,000 | 118,382,000 |
Gross Unrecognized Gains |  | 59,000 |
Gross Unrecognized Losses | (26,529,000) | (1,141,000) |
Fair Value | 261,430,000 | 117,300,000 |
Agency collateralized mortgage obligations ("CMOs") |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 198,049,000 | 60,927,000 |
Gross Unrecognized Gains | 328,000 |  |
Gross Unrecognized Losses | (12,693,000) | (873,000) |
Fair Value | $ 185,684,000 | $ 60,054,000 |

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